∞Shatei Majutsu Tsukai no Ore wa, Yagate Gakuen no Chouten he

Certo is a boy born in a village on the border between the demon realm and the human realm. Because of his upbringing in this special environment, he gained the extraordinary ability to fire ultra-long-range magic that defeated the academy's hero candidates before they could even move! An unparalleled school fantasy beyond the range of all common sense!

(Source: Sneaker Bunko, translated)